[특허]Air-injection system to improve effectiveness of selective catalytic reduction catalyst

Air-injection system to improve effectiveness of selective catalytic reduction catalyst 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F01N-003/00 F01N-003/10 F01N-003/20 B01D-053/94 F01N-003/08 F01N-003/30 F01N-013/00
출원번호	US-0319456 (2014-06-30)
등록번호	US-9376949 (2016-06-28)
발명자 / 주소	Gandhi, Harendra S. McCabe, Robert Walter Theis, Joseph Robert
출원인 / 주소	Ford Global Technologies, LLC
대리인 / 주소	Porcari, Damian
인용정보	피인용 횟수 : 0 인용 특허 : 19

초록 ▼

Embodiments are described to improve the durability of a lean NOx aftertreatment system. According to one embodiment of the present invention an air injection system is used to inject air continuously into the exhaust system between the upstream three-way catalyst and the downstream selective catalytic reduction (SCR) catalyst when the engine is operating at stoichiometric or rich air/fuel ratios and the exhaust temperatures are above a calibratable level (e.g., 700° C.). In another embodiment, an oxidation catalyst is positioned downstream of the air injection point to prevent exothermic reactions from occurring on the SCR. In another embodiment, the reductant for the SCR is generated in-situ. In yet another embodiment, a diverter valve with a reduction catalyst in a bypass arm is utilized to bypass the SCR during high load conditions.

대표청구항 ▼

1. A durable catalyst system for the reduction of emissions from a gasoline engine exhaust stream, comprising: a light-off catalyst closely coupled to the engine;a selective catalytic reduction catalyst positioned downstream of the light-off catalyst;a reductant injection system positioned between the light-off catalyst and the selective catalytic reduction catalyst; andan air injection system positioned between the light-off catalyst and the location for reductant injection to inject air into the exhaust stream at designated engine conditions to improve the durability of the selective catalytic reduction catalyst,wherein an oxidation catalyst is positioned between the location for air injection and the location for reductant injection to prevent exothermic reactions from occurring on the selective reduction catalyst and impairing durability. 2. The system of claim 1, wherein engine controls are provided that operate in conjunction with the air injection system to inject air into the exhaust stream under designated conditions to improve the durability of the selective catalytic reduction catalyst. 3. The system of claim 1, wherein the air injection system is a pump that provides a continuous stream of air under the designated conditions. 4. The system of claim 1, wherein the air injection system provides pulsed air under the designated conditions. 5. The system of claim 1, wherein the light-off catalyst is a three-way catalyst. 6. The system of claim 1, wherein the oxidation catalyst is a Pd-based three-way catalyst having a Pd loading between 2 and 10 pgcf. 7. The system of claim 1, wherein the reductant that is injected is ammonia. 8. The system of claim 1, wherein the reductant that is injected is urea. 9. A method of improving the durability of a catalyst system for reducing emissions from lean-burn gasoline engine exhaust emissions, comprising the following steps: providing a catalyst system that includes a light-off catalyst closely coupled to the engine and a selective catalytic reduction catalyst positioned downstream from the light-off catalyst;injecting air between the light-off catalyst and the selective catalytic reduction catalyst at certain designated engine conditions that could harm the durability of the selective catalytic reduction catalyst; andinjecting a reductant upstream of the selective catalytic reduction catalyst,wherein an oxidation catalyst is positioned between the location for air injection and the location for reductant injection to prevent exothermic reactions from occurring on the selective reduction catalyst and impairing durability. 10. The method of claim 9, wherein the oxidation catalyst is a Pd-based three-way catalyst having a Pd loading between 2 and 10 pgcf. 11. The method of claim 9, wherein the reductant that is injected is ammonia. 12. The method of claim 9, wherein the reductant that is injected is urea.

이 특허에 인용된 특허 (19)

Szymkowicz, Patrick G., After-treatment system and method for reducing emissions in diesel engine exhaust.
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Montreuil,Clifford Norman; Theis,Joseph Robert, Bimodal catalyst-urea SCR system for enhanced NOconversion and durability.
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Wnuck, Wayne G.; Liu, Ke, CPO regenerated lean NOx trap with no moving parts.
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Murphy,Oliver J.; Andrews,Craig C., Catalytic reduction of emissions from internal combustion engines.
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Ketcham Thomas D., Close-coupled catalytic converter system.
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Boegner Walter,DEX ; Haak Karl-Ernest,DEX ; Krutzsch Bernd,DEX ; Voigtlaender Dirk,DEX ; Wenninger Guenter,DEX ; Wirbeleit Friedrich,DEX, Emission control system for an internal-combustion engine.
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Hirota, Shinya; Toshioka, Shunsuke; Tanaka, Toshiaki, Exhaust emission control device of internal combustion engine.
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Hirooka, Shigemasa; Yoshioka, Mamoru, Exhaust gas purification device of internal combustion engine and method therefore.
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Kakwani, Ramesh M.; Voss, Kenneth C.; Patchett, Joseph A.; Grimston, Karl R., Exhaust system for enhanced reduction of nitrogen oxides and particulates from diesel engines.
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Hu, Haoran; Stover, Thomas R., Hybrid catalyst system for exhaust emissions reduction.
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Boegner Walter,DEX ; Haak Karl-Ernst,DEX ; Krutzsch Bernd,DEX ; Verrelst Wim,BEX ; Voigtlaender Dirk,DEX ; Wenninger Guenter,DEX ; Wirbeleit Friedrich,DEX, Internal combustion engine exhaust emission control system with adsorbers for nitrogen oxides.
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Zurbig Jurgen,DEX ; Tost Rainer,DEX ; Dolling Winfried,DEX ; Latsch Reinhard,DEX, Method and device for operating an internal combustion engine operating with an excess of air.
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Kupe, Joachim; Zizelman, James; Botti, Jean J., Method and system for regenerating NOx adsorbers and/or particulate filters.
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Bartley Gordon J., Method for reducing cold-start hydrocarbon emissions in a gasoline, natural gas, or propane fueled engine.
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Kawai, Kenji; Takahashi, Yoshinori; Saito, Shinichi; Kawatani, Toru; Takeda, Yoshinaka; Shinozaki, Ristuko; Doumeki, Reiko; Hashizume, Takeshi; Hiranuma, Satoshi, NOx cleaning apparatus and NOx cleaning method for internal combustion engine.
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Edward N. Balko ; Kenneth E. Voss, Plasma fuel processing for NOx control lean burn engines.
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Johnston Gary Edwin ; Aro William R. ; Jubenville John E., Secondary air injection system for an internal combustion engine.
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Bayerle, Klaus; Hacker, Frank; Zhang, Hong, System and method for monitoring the feeding of secondary air into the exhaust as of an internal combustion engine.
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Calvo,Sabine; Dupre,Sandrine; Eymerie,Stephane; Goldman,Alice; Goldman,Max; Lendresse,Yvane, System for exhaust gas treatment comprising a gas ionizing system with ionized air injection.
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연합인증

Air-injection system to improve effectiveness of selective catalytic reduction catalyst 원문보기

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